It is normally an easy repair. You need to
replace the (D-shapped) pickup
roller. Eitehr the complete pickup shaft assembly, or if you want to save
money and do a little more work, just the roller (the latter is what I
always do). It's a common problem on SX printers.
Tony, do you have an EASY source for these rollers? I have 3 or 4 SX
I've always bought them (and other Cannon engine parts) from The
PrinterWorks (
http://www.printerworks.com). They ship to England, I have
no idea if they ship to Brazil.
Oh yes, if you change the roller, change the 'separation pad' (the little
cork-looking pad that holds the paper against the pickup roller) too.
-tony